US5289812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine air/fuel ratio compensation
Assignee: GM Global Technology Operations LLC
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Filing: 1993-06-01
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Granted: 1994-03-01
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Expires: 2013-06-01
Abstract
Abstract Engine inlet air/fuel ratio compensation is applied to an internal combustion engine having pneumatic fuel injection, wherein the difference between a value proportional to inlet air pressure and a value proportional to inlet fuel pressure is monitored and a commanded fuel or air quantity adjusted as a predetermined function of the difference.
Inventors
- 👤 Douglas E. Trombley
- 👤 Kenneth J. Buslepp
- 👤 William C. Albertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
F; F02; F02M; F02M67/00; F02M67/02; F02D; F02D43/00; F02D7/00; F02D7/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A method for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising the steps of: sensing pressure of fuel from the fuel supply; sensing pressure of air from the air supply; determining a difference between the sensed fuel pressure and the sensed air pressure; generating a compensation value as a predetermined function of the determined difference; and adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
Claim 2
Independent Claim
112 words
A method for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising the steps of: sensing pressure of fuel from the fuel supply; sensing pressure of air from the air supply; determining a difference between the sensed fuel pressure and the sensed air pressure; generating a compensation value as a predetermined function of the determined difference; and adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
Claim 3
Dependent Claim
67 words
The method of claim 1, further comprising the steps of: determining a fuel pressure value as a predetermined function of sensed fuel pressure over a predetermined time period; determining an air pressure value as a predetermined function of sensed air pressure over the predetermined time period; and wherein the difference determining step determines a difference between the determined fuel pressure value and the determined air pressure value.
Claim 4
Dependent Claim
36 words
The method of claim 2, wherein the predetermined function of sensed fuel pressure is an integration of sensed fuel pressure and wherein the predetermined function of sensed air pressure is an integration of sensed air pressure.
Claim 5
Independent Claim
125 words
An apparatus for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising: a fuel pressure sensor positioned to sense pressure of fuel from the fuel supply; an air pressure sensor positioned to sense pressure of air from the air supply; means for determining a difference between sensed fuel pressure and sensed air pressure; means for generating a compensation value as a predetermined function of the determined difference; and means for adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
Claim 6
Independent Claim
125 words
An apparatus for compensating a ratio of fuel to air admitted to an internal combustion engine having pneumatic fuel injection, wherein a quantity of air from a pressurized air supply is provided to inject a quantity of fuel from a fuel supply into the engine, comprising: a fuel pressure sensor positioned to sense pressure of fuel from the fuel supply; an air pressure sensor positioned to sense pressure of air from the air supply; means for determining a difference between sensed fuel pressure and sensed air pressure; means for generating a compensation value as a predetermined function of the determined difference; and means for adjusting a predetermined one of the group consisting of the fuel quantity and the air quantity by the generated compensation value.
Claim 7
Dependent Claim
76 words
The apparatus of claim 4, further comprising: fuel pressure value determining means for determining a fuel pressure value as a predetermined function of sensed fuel pressure over a predetermined time period; air pressure value determining means for determining an air pressure value as a predetermined function of sensed air pressure over the predetermined time period; and wherein the difference determining means determines a difference between the determined fuel pressure value and the determined air pressure value.
Claim 8
Dependent Claim
36 words
The method of claim 5, wherein the fuel pressure value determining means is an integrator for integrating sensed fuel pressure and wherein the air pressure value determining means is an integrator for integrating sensed air pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |